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68 lines
2.2 KiB
C
68 lines
2.2 KiB
C
// xtensa_overlay_os_hook.c -- Overlay manager OS hooks for FreeRTOS.
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// Copyright (c) 2015-2015 Cadence Design Systems Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#include "FreeRTOS.h"
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#include "semphr.h"
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#if configUSE_MUTEX
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/* Mutex object that controls access to the overlay. Currently only one
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* overlay region is supported so one mutex suffices.
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*/
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static SemaphoreHandle_t xt_overlay_mutex;
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/* This function should be overridden to provide OS specific init such
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* as the creation of a mutex lock that can be used for overlay locking.
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* Typically this mutex would be set up with priority inheritance. See
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* overlay manager documentation for more details.
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*/
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void xt_overlay_init_os(void)
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{
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/* Create the mutex for overlay access. Priority inheritance is
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* required.
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*/
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xt_overlay_mutex = xSemaphoreCreateMutex();
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}
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/* This function locks access to shared overlay resources, typically
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* by acquiring a mutex.
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*/
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void xt_overlay_lock(void)
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{
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xSemaphoreTake(xt_overlay_mutex, 0);
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}
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/* This function releases access to shared overlay resources, typically
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* by unlocking a mutex.
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*/
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void xt_overlay_unlock(void)
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{
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xSemaphoreGive(xt_overlay_mutex);
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}
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#endif
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